State law prohibits campaign contributions from those regulated by the Oklahoma Corporation Commission unless received during the exemption period, which begins 120 days prior to a primary election and ends 120 days after the general election. The exemption period will begin February 27, 2018.

Corporate contributions are prohibited by law. The maximum contribution to a candidate committee per individual is $2,700 prior to a primary in which the candidate appears on the ballot, $2,700 prior to a runoff primary in which the candidate appears on the ballot and $2,700 prior to a general election in which the candidate appears on the ballot.